Ensure UKM only sends URLs under a specific length (currently 2K).

components/ukm/ukm_service_unittest.cc

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/ukm/ukm_service.h"
 
 #include <map>
 #include <string>
 #include <utility>
 
@@ skipping 523 matching lines @@
 
   const Entry& proto_entry_a = proto_report.entries(0);
   EXPECT_EQ(id, proto_entry_a.source_id());
   EXPECT_EQ(base::HashMetricName("EntryA"), proto_entry_a.event_hash());
 
   const Entry& proto_entry_b = proto_report.entries(1);
   EXPECT_EQ(id, proto_entry_b.source_id());
   EXPECT_EQ(base::HashMetricName("EntryB"), proto_entry_b.event_hash());
 }
 
+TEST_F(UkmServiceTest, SourceURLLength) {
+  UkmService service(&prefs_, &client_);
+  EXPECT_EQ(0, GetPersistedLogCount());
+  service.Initialize();
+  task_runner_->RunUntilIdle();
+  service.EnableRecording();
+  service.EnableReporting();
+
+  auto id = UkmService::GetNewSourceID();
+
+  // This URL is too long to be recorded fully.
+  const std::string long_string = "https://" + std::string(10000, 'a');
+  service.UpdateSourceURL(id, GURL(long_string));
+
+  service.Flush();
+  EXPECT_EQ(1, GetPersistedLogCount());
+
+  auto proto_report = GetPersistedReport();
+  ASSERT_EQ(1, proto_report.sources_size());
+  const Source& proto_source = proto_report.sources(0);
+  EXPECT_EQ("URLTooLong", proto_source.url());
+}
+
 }  // namespace ukm